Use of KOH in IBA dissolution and substrate formulation in the rooting of Acer palmatum Thunb. cuttings

Luciana Pinto Paim,Eduarda Demari Avrella,Monique Caumo,Claudimar Sidnei Fior

doi:10.31167/csecfv0i47.19910

Luciana Pinto Paim, Eduarda Demari Avrella + Show 2 more

Open Access

https://doi.org/10.31167/csecfv0i47.19910

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Abstract

Acer palmatum is a species widely used in landscaping in southern Brazil. It has some limitations in propagation via seeds, therefore, cutting is a viable propagation method, especially when plant regulators and plant substrates are properly. The objective was to evaluate substrate and solvent compositions for indolebutyric acid (IBA) dissolution in the rooting of Acer palmatum cuttings. Apical herbaceous cuttings were used and inserted for five seconds in IBA solution (8 g L-1) diluted in hydroalcoholic solvents (50%) and potassium hydroxide (0.5 M KOH). Then, they were established in multicellular trays with substrates carbonized rice husk (CRH) and expanded clay (EXCL), isolates and in mixtures (1:1; 2:1 and 1:2, v/v). The experimental design was completely randomized in a 2 x 5 bifactorial scheme (forms of dissolution of IBA x substrates), in four replications of 10 cuttings. The results showed no interaction between the factors. However, the dissolution of IBA in KOH and the substrates CRH and EXCL (1:2 and 2:1, v/v) provided higher rooting and leaf retention. In addition, the substrates showed greater root dry mass and aerial part for cutting development. Therefore, vegetative propagation of Acer palmatum through cuttings is more appropriate with the dissolution of IBA with KOH solvent (66.84% rooting) and formulated substrates CRH and EXCL (1:2 and 2:1, v/v) (66.87% rooting).

Highlights

There is a growing demand for seedlings of plant species that have potential for use in the restoration of degraded areas, in addition to characteristics that allow their economic exploitation, such as, for example, in the ornamentation and landscaping of external spaces
The first factor consisted of the forms of dissolution of indolebutyric acid (IBA), and the second factor consisted of the substrate formulations: carbonized rice husk (CRH), and expanded clay (EXCL – 7 mm in particle size), CRH + EXCL (1:1, v/v), CRH + EXCL (2:1, v/v) and CRH + EXCL (1:2, v/v)
The cuttings were kept in containers with water for approximately 10 minutes and afterwards they were immersed in solutions of indolebutyric acid (IBA), and the immersion in water was intended to reduce the effect of possible oxidation and dehydration

Summary

Introduction

There is a growing demand for seedlings of plant species that have potential for use in the restoration of degraded areas, in addition to characteristics that allow their economic exploitation, such as, for example, in the ornamentation and landscaping of external spaces. Cutting is a widely used asexual propagation method based on the insertion of a particular plant segment, such as branches, roots or leaves, into a suitable medium (substrate), resulting in the production of adventitious roots. The success of rooting depends on some external factors, such as the substrate, which must provide support to the cuttings and maintain an appropriate balance between water retention and the aeration space. It is an manipulated component and available in several options, so that each has different physical and chemical characteristics. In relation to the cuttings, it is desirable that the substrates have high macroporosity, in order to promote aeration of the root system, and the rooting of the propagative material (Zorzeto et al, 2014)

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